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11-10-2011, 12:50 PM
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#1
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Veteran Member
Join Date: Oct 2011
Posts: 42
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3208 T, Engine RPM
What are the reccomendations for running the 3208 T engines? 1500 RPM delivers 9knots for me...but what is the best fuel consumption for the speed?
We have a 1980 38 californian
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11-11-2011, 02:40 AM
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#2
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Guru
Join Date: Oct 2007
Posts: 22,553
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RE: 3208 T, Engine RPM
."but what is the best fuel consumption for the speed?"
Usually the sq rt of the lwl times .9 to 1.15 is the lowest cost lowest fuel burn speed.
That's why so many "trawlers" run 6-7K
Weather ypur turbo will allow such low speeds will depend on your installation.
You should have positive boost , at least 1 pound to not harm the engine .
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10-19-2015, 09:37 PM
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#3
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Member
City: Mystic
Join Date: Oct 2015
Posts: 11
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Can't help you with the rpm.
However I am interested in who make the transmission for the 3208?
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10-19-2015, 10:42 PM
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#4
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Guru
City: Anacortes
Join Date: Nov 2012
Posts: 1,189
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Mine is a twin disc. Don't think there is a "the" transmission.
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10-19-2015, 10:46 PM
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#5
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Guru
City: Alabama
Vessel Name: Waypoint
Vessel Model: Californian 48' CPMY
Join Date: Dec 2013
Posts: 506
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__________________
Jon
------------------------------------------------
Waypoint's are abstract, often having no obvious relationship to any distinctive features of the real world.
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10-20-2015, 08:26 AM
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#6
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Quote:
Originally Posted by FF
."but what is the best fuel consumption for the speed?"
Usually the sq rt of the lwl times .9 to 1.15 is the lowest cost lowest fuel burn speed.
That's why so many "trawlers" run 6-7K
Weather ypur turbo will allow such low speeds will depend on your installation.
You should have positive boost , at least 1 pound to not harm the engine .
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Where does this 1psi of boost limit come from? Never heard of such a thing. If engine load does not require boost, turbo will happily idle along without harm.
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10-20-2015, 08:35 AM
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#7
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Guru
City: gulf coast
Join Date: Jun 2014
Posts: 3,440
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Agreed as long as the engine gets to proper operating temp dont worry about boost or other myths.
Best fuel consumption vs speed will be at a speed that keeps the bow down. any excessive wave making is wasting fuel. Forget all the math and find the speed where your boat doesn't make waves. Notice that this has nothing to do with rpm, engine make or specifications just your hull moving as fast as possible while making the least water disturbance.
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10-20-2015, 09:01 AM
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#8
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Senior Member
Join Date: Sep 2015
Posts: 204
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Quote:
Originally Posted by bayview
Agreed as long as the engine gets to proper operating temp dont worry about boost or other myths.
Best fuel consumption vs speed will be at a speed that keeps the bow down. any excessive wave making is wasting fuel. Forget all the math and find the speed where your boat doesn't make waves. Notice that this has nothing to do with rpm, engine make or specifications just your hull moving as fast as possible while making the least water disturbance.
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Many (most?) turbocharged engines have a lower compression ratio than NA. I believe the "on boost" recommendation probably stems from this with the thought that if the turbo is providing pressure, then the combustion process is probably more complete and internal temperatures are more likely to be where they should be. The turbo engines in our boat do not reach normal operating temperature when idling along at 35 HP per side @ 9 KTS.
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10-20-2015, 09:37 AM
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#9
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Gad. Four year old thread. Just noticed that.
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